#Get your App token

• PHP
• NodeJS
• Python
• Java Spring

    // Let's create an `activate.php` file
    
    $oauthClientId = '<CLIENT_ID>';
    $getAuthorizationUrl = '%s/connect/apps/v1/authorize?%s';
    $scopes = ['read_products', 'write_products', 'delete_products'];
    
    session_start();
    
    $pimUrl = $_GET['pim_url'];
    if (empty($pimUrl)) {
        exit('Missing PIM URL in the query');
    }
    
    // create a random state for preventing cross-site request forgery
    $state = bin2hex(random_bytes(10));
    
    // Store in the user session the state and the PIM URL
    $_SESSION['oauth2_state'] = $state;
    $_SESSION['pim_url'] = $pimUrl;
    
    // Build the parameters for the Authorization Request
    // https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.1
    $authorizeUrlParams = http_build_query([
        'response_type' => 'code',
        'client_id' => $oauthClientId,
        'scope' => implode(' ', $scopes),
        'state' => $state,
    ]);
    
    // Build the url for the Authorization Request using the PIM URL
    $url = sprintf($getAuthorizationUrl, $pimUrl, $authorizeUrlParams);
    header('Location: '.$url);
    exit;
    

    import express from 'express';
    import crypto from 'crypto';
    
    const app = express();
    
    app.get('/activate', (req, res, next) => {
      try {
        const clientId = "AKENEO_CLIENT_ID";
        const scopes = [
          "read_products",
          "read_catalog_structure",
          "read_channel_settings",
          "read_channel_localization",
          "read_attribute_options",
          "read_catalogs",
          "write_catalogs",
          "delete_catalogs",
        ];
        const session = req.session;
    
        const pimUrl = req.query.pim_url;
        if (!pimUrl) {
          throw new Error(
            "Can't retrieve PIM url, please restart the authorization process."
          );
        }
    
        // Create a random state for preventing cross-site request forgery
        const state = crypto.randomBytes(64).toString("hex");
    
        // Store in the user session the state and the PIM URL
        session.state = state;
        session.pim_url = pimUrl;
    
        // Build the parameters for the Authorization Request
        // https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.1
        const params = new URLSearchParams({
          response_type: "code",
          client_id: clientId,
          scope: scopes.join(" "),
          state: state,
        });
    
        // Build the url for the Authorization Request using the PIM URL
        const authorizeUrl =
          pimUrl + "/connect/apps/v1/authorize?" + params.toString();
    
        res.redirect(authorizeUrl);
      } catch (err) {
        next(err);
      }
    });
    
    

    import secrets
    from urllib.parse import urljoin
    
    params # data from your request handling
    storage # your own memory system
    
    # Retrieve GET query params from your own framework / http handler
    pim_url: str = params.get('pim_url')
    
    # Retrieve your app's Client ID with your own system
    client_id: str = storage.get("CLIENT_ID")
    
    # The activate URL should have the pim_url param
    if not pim_url:
        # Return a Bad request response via your own framework / http server
        return response(502, {"message": "Bad request"})
    
    # Store the PIM url value with your own system
    storage.set("PIM_URL", pim_url)
    
    # Set the access scopes, take care of the 254 chars max !
    scopes: str = 'read_products write_products'
    
    # Set a new security state secret and store it with your own system
    state: str = secrets.token_hex(32)
    storage.set("APP_STATE", state)
    
    # Redirect to the PIM with "connect" options needed
    redirect_url: str = urljoin(
        pim_url,
        f"/connect/apps/v1/authorize"
        f"?response_type=code"
        f"&client_id={client_id}"
        f"&scope={scopes}"
        f"&state={state}",
    )
    # Set the redirection response with your own framework / http server
    return redirect(redirect_url)
    

    import java.security.SecureRandom;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    
    import org.apache.tomcat.util.buf.HexUtils;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    public class App {
        static final String OAUTH_CLIENT_ID = "CLIENT_ID";
        static final String OAUTH_SCOPES = "read_products write_products";
        
        @GetMapping("/activate")
        public void activate(
                HttpServletRequest request,
                HttpSession session,
                HttpServletResponse response) throws Exception {
            // Create a random state for preventing cross-site request forgery
            byte[] randomBytes = new byte[10];
            new SecureRandom().nextBytes(randomBytes);
            String state = HexUtils.toHexString(randomBytes);
        
            Object pimUrl = request.getParameter("pim_url");
            if (pimUrl == null) {
                throw new Exception("Missing PIM URL in the query");
            }
        
            // Store in the user session the state and the PIM URL
            session.setAttribute("oauth2_state", state);
            session.setAttribute("pim_url", pimUrl.toString());
        
            // Build url for the Authorization Request
            // https://datatracker.ietf.org/doc/html/rfc6749#section-4.1.1
            String authorizeUrl = pimUrl + "/connect/apps/v1/authorize" + "?response_type=code"
                    + "&client_id=" + OAUTH_CLIENT_ID
                    + "&scope=" + OAUTH_SCOPES + "&state=" + state;
        
            // Redirect the user to the Authorization URL
            response.sendRedirect(authorizeUrl);
        }
    }
    

• PHP
• NodeJS
• Python
• Java Spring

    // Let's create a `callback.php` file
    
    require_once __DIR__ . '/../vendor/autoload.php';
    
    $oauthClientId = '<CLIENT_ID>';
    $oauthClientSecret = '<CLIENT_SECRET>';
    $generateTokenUrl = '/connect/apps/v1/oauth2/token';
    
    session_start();
    
    // We check if the received state is the same as in the session, for security.
    $sessionState = $_SESSION['oauth2_state'] ?? '';
    $state = $_GET['state'] ?? '';
    if (empty($state) || $state !== $sessionState) {
        exit('Invalid state');
    }
    
    $authorizationCode = $_GET['code'] ?? '';
    if (empty($authorizationCode)) {
        exit('Missing authorization code');
    }
    
    $pimUrl = $_SESSION['pim_url'] ?? '';
    if (empty($pimUrl)) {
        exit('No PIM url in session');
    }
    
    // Generate code for token request
    $codeIdentifier = bin2hex(random_bytes(30));
    $codeChallenge = hash('sha256', $codeIdentifier . $oauthClientSecret);
    
    // Build form data to post
    $accessTokenRequestPayload = [
        'client_id' => $oauthClientId,
        'code_identifier' => $codeIdentifier,
        'code_challenge' => $codeChallenge,
        'code' => $authorizationCode,
        'grant_type' => 'authorization_code',
    ];
    
    // If you haven't set your client yet, please install Guzzle by following the official documentation:
    // https://docs.guzzlephp.org/en/stable/overview.html#installation
    $client = new GuzzleHttp\Client(['base_uri' => $pimUrl]);
    
    // Make an authenticated call to the API
    $accessTokenUrl = $pimUrl . $generateTokenUrl;
    $response = $client->post($accessTokenUrl, ['form_params' => $accessTokenRequestPayload]);
    
    // Convert json response to array
    $contents = json_decode($response->getBody()->getContents(), true);
    
    // Save token into storage
    storeToken($contents['access_token']);
    
    

    import express from 'express';
    import crypto from 'crypto';
    import fetch from 'node-fetch'; // https://www.npmjs.com/package/node-fetch
    
    const app = express();
    
    app.get('/callback', async (req, res, next) => {
      try {
        const appClientSecret = "CLIENT_SECRET";
        const appClientId = "CLIENT_ID";
    
        const session = req.session;
    
        const pimUrl = session.pim_url;
        const state = req.query.state;
        const authorizationCode = req.query.code;
    
        if (!pimUrl) {
          throw new Error(
            "Can't retrieve PIM url, please restart the authorization process."
          );
        }
    
        // We check if the received state is the same as in the session, for security.
        if (!state || state != session.state) {
          throw new Error("Invalid state");
        }
    
        if (!authorizationCode) {
          throw new Error("Missing authorization code");
        }
    
        // Generate code for token request
        const codeidentifier = crypto.randomBytes(64).toString("hex");
        const codeChallenge = crypto
          .createHash("sha256")
          .update(codeidentifier + appClientSecret)
          .digest("hex");
    
        // Build form data to post
        const accessTokenRequestPayload = new URLSearchParams({
          grant_type: "authorization_code",
          code: authorizationCode,
          client_id: appClientId,
          code_identifier: codeidentifier,
          code_challenge: codeChallenge,
        });
    
        // Make an authenticated call to the API
        const accessTokenUrl = pimUrl + "/connect/apps/v1/oauth2/token";
        const response = await fetch(accessTokenUrl, {
          method: "post",
          body: accessTokenRequestPayload,
          headers: {"Content-Type": "application/x-www-form-urlencoded"},
        });
    
        const result = await response.json();
    
        const accessToken = result.access_token;
    
        console.log(accessToken);
      } catch (err) {
        next(err);
      }
    });
    
    

    import secrets
    import hashlib
    import requests
    from urllib.parse import urljoin
    
    params # data from your request handling
    storage # your own memory system
    
    # Retrieve GET query params from your own framework / http handler
    code: str = params.get('pim_url')
    state: str = params.get('pim_url')
    
    # Retrieve your app's variables with your own system
    pim_url: str = storage.get("PIM_URL")
    app_state: str = storage.get("APP_STATE")
    client_id: str = storage.get("CLIENT_ID")
    client_secret: str = storage.get("CLIENT_SECRET")
    
    # Control the security state integrity previously defined, to avoid attacks
    if state != app_state:
        return response(403, 
            {
                "error": "Forbidden",
                "error_description": "State integrity failed",
            }
        )
    
    # Generate a new challenge code
    # a sha256 concatenation of a code_identifier and the client_secret
    code_identifier: str = secrets.token_hex(32)
    code_challenge: str = hashlib.sha256(f"{code_identifier}{client_secret}".encode("utf-8")).hexdigest()
    
    # Send the payload to the PIM instance, ask for an API Token
    data = requests.post(
        urljoin(
            pim_url,
            "/connect/apps/v1/oauth2/token",
        ),
        data={
            "code": code,
            "grant_type": "authorization_code",
            "client_id": client_id,
            "code_identifier": code_identifier,
            "code_challenge": code_challenge,
        },
        headers={
            "Content-Type": "application/x-www-form-urlencoded",
        },
    ).json()
    
    # Retrieve the fresh token and store it with your own system
    token: str = data.get("access_token")
    storage.set("API_TOKEN", token)
    
    # Set the redirection response with your own framework / http server
    return redirect("/")
    

    import java.net.URI;
    import java.net.http.HttpClient;
    import java.net.http.HttpRequest;
    import java.net.http.HttpRequest.BodyPublishers;
    import java.net.http.HttpResponse;
    import java.net.http.HttpResponse.BodyHandlers;
    import java.nio.charset.StandardCharsets;
    import java.security.MessageDigest;
    import java.security.SecureRandom;
    
    import javax.json.Json;
    import javax.json.JsonObject;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpSession;
    
    import org.apache.tomcat.util.buf.HexUtils;
    import org.springframework.web.bind.annotation.GetMapping;
    
    public class App {
        static final String OAUTH_CLIENT_SECRET = "CLIENT_SECRET";
        
        @GetMapping("/callback")
        public String callback(
                HttpServletRequest request,
                HttpSession session) throws Exception {
            Object sessionState = session.getAttribute("oauth2_state");
            String stateParam = request.getParameter("state");
        
            // We check if the received state is the same as in the session, for security.
            if (sessionState == null || !sessionState.equals(stateParam)) {
                throw new Exception("Invalid state");
            }
        
            Object code = request.getParameter("code");
            if (code == null) {
                throw new Exception("Missing authorization code");
            }
        
            Object pimUrl = session.getAttribute("pim_url");
            if (pimUrl == null) {
                throw new Exception("No PIM url in session");
            }
        
            // Generate code challenge
            byte[] randomBytes = new byte[30];
            new SecureRandom().nextBytes(randomBytes);
            String codeIdentifier = HexUtils.toHexString(randomBytes);
        
            MessageDigest digest = MessageDigest.getInstance("SHA-256");
            byte[] codeChallengeBytes = digest
                    .digest((codeIdentifier + OAUTH_CLIENT_SECRET)
                            .getBytes(StandardCharsets.UTF_8));
            String codeChallenge = HexUtils.toHexString(codeChallengeBytes);
        
            String accessTokenUrl = pimUrl + "/connect/apps/v1/oauth2/token";
        
            JsonObject json = Json.createObjectBuilder()
                    .add("client_id", OAUTH_CLIENT_ID)
                    .add("code_identifier", codeIdentifier)
                    .add("code_challenge", codeChallenge)
                    .add("code", code.toString())
                    .add("grant_type", "authorization_code")
                    .build();
        
            // Do a POST request on the token endpoint
            HttpClient client = HttpClient.newHttpClient();
            HttpRequest authorizeRequest = HttpRequest.newBuilder()
                    .uri(URI.create(accessTokenUrl))
                    .header("Content-Type", "application/json")
                    .POST(BodyPublishers.ofString(json.toString()))
                    .build();
        
            HttpResponse<String> response = client
                    .send(authorizeRequest, BodyHandlers.ofString());
        
            return response.body();
        }
    }